# How to factor 2x^2+x-1 ?

## i tried to factor it and i got $\left(2 x + 1\right) \left(x - 1\right)$ but my friend said the correct answer is $\left(2 x - 1\right) \left(x + 1\right)$

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I want someone to double check my answer

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Jokekok Share
Mar 9, 2018

It is (2x-1)(x+1), you're friend is right.

#### Explanation:

If you multiply it back out, you should get the original equation. Your answer (2x+1)(x-1) is equal to 2x^2-x-1. That does not equal the original one.

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